... etc, and China's standard 4053-83. Matt stainless steel surface is in line with environmental requirements. Type IndicationI. ... below. VII. Materials: C = carbon steel; S=stainless steelVIII. Oter Ball-connected Handrail Railing Specification Table SizeOut Diameter of BallOut ... S, SC, SO, MB (Multi ball).2. Types of Inclined Railing include PA, CA, WA, SAL, SAR, AM, SOAL, SOAR. ball joint handrail